Check sibling questions

Ex 14.2, 5 (ii) - Factorise q^2 - 10q + 21  - Chapter 14 Class 8 NCERT

Introducing your new favourite teacher - Teachoo Black, at only β‚Ή83 per month


Transcript

Ex 14.2, 5 Factorise the following expressions. (ii) π‘ž^2 – 10q + 21 π‘ž^2 – 10q + 21 By middle term splitting = π‘ž^2βˆ’3π‘žβˆ’7π‘ž+21 = (π‘ž^2βˆ’3π‘ž)βˆ’(7π‘žβˆ’21) = q (q βˆ’ 3) βˆ’ 7(q βˆ’ 3) Taking (q βˆ’ 3) common, = (q βˆ’ 3) (q βˆ’ 7) Splitting the middle term We need to find two numbers whose Sum = βˆ’10 Product = 21 So, we write βˆ’10q = βˆ’3q βˆ’ 7q

Davneet Singh's photo - Teacher, Engineer, Marketer

Made by

Davneet Singh

Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 12 years. He provides courses for Maths and Science at Teachoo.